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Subject[PATCH 2/3] PCI: revise VPD access interface
Change PCI VPD API which was only used by sysfs to something usable
in drivers.
* move iteration over multiple words to the low level
* cleanup types of arguments
* add exportable wrapper

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>

--- a/drivers/pci/access.c 2008-09-04 10:16:52.000000000 -0700
+++ b/drivers/pci/access.c 2008-09-04 10:19:47.000000000 -0700
@@ -66,6 +66,39 @@ EXPORT_SYMBOL(pci_bus_write_config_byte)
EXPORT_SYMBOL(pci_bus_write_config_word);
EXPORT_SYMBOL(pci_bus_write_config_dword);

+
+/**
+ * pci_read_vpd - Read one entry from Vital Product Data
+ * @dev: pci device struct
+ * @pos: offset in vpd space
+ * @count: number of bytes to read
+ * @buf: pointer to where to store result
+ *
+ */
+int pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf)
+{
+ if (!dev->vpd || !dev->vpd->ops)
+ return -ENODEV;
+ return dev->vpd->ops->read(dev, pos, count, buf);
+}
+EXPORT_SYMBOL(pci_read_vpd);
+
+/**
+ * pci_write_vpd - Write entry to Vital Product Data
+ * @dev: pci device struct
+ * @pos: offset in vpd space
+ * @count: number of bytes to read
+ * @val: value to write
+ *
+ */
+int pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf)
+{
+ if (!dev->vpd || !dev->vpd->ops)
+ return -ENODEV;
+ return dev->vpd->ops->write(dev, pos, count, buf);
+}
+EXPORT_SYMBOL(pci_write_vpd);
+
/*
* The following routines are to prevent the user from accessing PCI config
* space when it's unsafe to do so. Some devices require this during BIST and
@@ -173,93 +206,97 @@ static int pci_vpd_pci22_wait(struct pci
return ret;
}

-static int pci_vpd_pci22_read(struct pci_dev *dev, int pos, int size,
- char *buf)
+static int pci_vpd_pci22_read(struct pci_dev *dev, loff_t pos, size_t count,
+ void *buf)
{
struct pci_vpd_pci22 *vpd =
container_of(dev->vpd, struct pci_vpd_pci22, base);
- u32 val;
int ret;
- int begin, end, i;
+ loff_t end = pos + count;
+ unsigned char *p = buf;

- if (pos < 0 || pos > vpd->base.len || size > vpd->base.len - pos)
+ if (pos < 0 || pos > vpd->base.len || count > vpd->base.len - pos)
return -EINVAL;
- if (size == 0)
- return 0;

ret = mutex_lock_killable(&vpd->lock);
if (ret)
return ret;
- ret = pci_vpd_pci22_wait(dev);
- if (ret < 0)
- goto out;
- ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
- pos & ~3);
- if (ret < 0)
- goto out;
- vpd->busy = true;
- vpd->flag = 1;
- ret = pci_vpd_pci22_wait(dev);
- if (ret < 0)
- goto out;
- ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA,
- &val);
-out:
- mutex_unlock(&vpd->lock);
- if (ret < 0)
- return ret;

- /* Convert to bytes */
- begin = pos & 3;
- end = min(4, begin + size);
- for (i = 0; i < end; ++i) {
- if (i >= begin)
- *buf++ = val;
- val >>= 8;
+ while (pos < end) {
+ u32 val;
+ unsigned int i, skip;
+
+ ret = pci_vpd_pci22_wait(dev);
+ if (ret < 0)
+ break;
+
+ ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
+ pos & ~3);
+ if (ret < 0)
+ break;
+ vpd->busy = true;
+ vpd->flag = 1;
+ ret = pci_vpd_pci22_wait(dev);
+ if (ret < 0)
+ break;
+
+ ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA, &val);
+ if (ret < 0)
+ break;
+
+ skip = pos & 3;
+ for (i = 0; i < sizeof(u32); i++) {
+ if (i >= skip) {
+ *p++ = val;
+ if (++pos == end)
+ break;
+ }
+ val >>= 8;
+ }
}
- return end - begin;
+ mutex_unlock(&vpd->lock);
+ return ret ? ret : count;
}

-static int pci_vpd_pci22_write(struct pci_dev *dev, int pos, int size,
- const char *buf)
+static int pci_vpd_pci22_write(struct pci_dev *dev, loff_t pos, size_t count,
+ const void *buf)
{
struct pci_vpd_pci22 *vpd =
container_of(dev->vpd, struct pci_vpd_pci22, base);
- u32 val;
+ loff_t end = pos + count;
int ret;

- if (pos < 0 || pos > vpd->base.len || pos & 3 ||
- size > vpd->base.len - pos || size < 4)
+ if (pos > vpd->base.len || pos & 3)
return -EINVAL;

- val = (u8) *buf++;
- val |= ((u8) *buf++) << 8;
- val |= ((u8) *buf++) << 16;
- val |= ((u32)(u8) *buf++) << 24;
-
ret = mutex_lock_killable(&vpd->lock);
if (ret)
return ret;
- ret = pci_vpd_pci22_wait(dev);
- if (ret < 0)
- goto out;
- ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA,
- val);
- if (ret < 0)
- goto out;
- ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
- pos | PCI_VPD_ADDR_F);
- if (ret < 0)
- goto out;
- vpd->busy = true;
- vpd->flag = 0;
- ret = pci_vpd_pci22_wait(dev);
-out:
- mutex_unlock(&vpd->lock);
- if (ret < 0)
- return ret;

- return 4;
+ while (pos < end) {
+ u32 val;
+
+ ret = pci_vpd_pci22_wait(dev);
+ if (ret < 0)
+ break;
+ memcpy(&val, buf, sizeof(u32));
+
+ ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA, val);
+ if (ret < 0)
+ break;
+ ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
+ pos | PCI_VPD_ADDR_F);
+ if (ret < 0)
+ break;
+ vpd->busy = true;
+ vpd->flag = 0;
+ ret = pci_vpd_pci22_wait(dev);
+
+ buf += sizeof(u32);
+ pos += sizeof(u32);
+ }
+ mutex_unlock(&vpd->lock);
+ return ret ? ret : count;
}

static void pci_vpd_pci22_release(struct pci_dev *dev)
@@ -267,7 +304,7 @@ static void pci_vpd_pci22_release(struct
kfree(container_of(dev->vpd, struct pci_vpd_pci22, base));
}

-static struct pci_vpd_ops pci_vpd_pci22_ops = {
+static const struct pci_vpd_ops pci_vpd_pci22_ops = {
.read = pci_vpd_pci22_read,
.write = pci_vpd_pci22_write,
.release = pci_vpd_pci22_release,
--- a/drivers/pci/pci.h 2008-09-04 10:14:59.000000000 -0700
+++ b/drivers/pci/pci.h 2008-09-04 10:17:01.000000000 -0700
@@ -44,14 +44,14 @@ extern int pci_user_write_config_word(st
extern int pci_user_write_config_dword(struct pci_dev *dev, int where, u32 val);

struct pci_vpd_ops {
- int (*read)(struct pci_dev *dev, int pos, int size, char *buf);
- int (*write)(struct pci_dev *dev, int pos, int size, const char *buf);
+ int (*read)(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
+ int (*write)(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
void (*release)(struct pci_dev *dev);
};

struct pci_vpd {
unsigned int len;
- struct pci_vpd_ops *ops;
+ const struct pci_vpd_ops *ops;
struct bin_attribute *attr; /* descriptor for sysfs VPD entry */
};

--- a/drivers/pci/pci-sysfs.c 2008-09-04 10:14:59.000000000 -0700
+++ b/drivers/pci/pci-sysfs.c 2008-09-04 10:17:01.000000000 -0700
@@ -360,55 +360,33 @@ pci_write_config(struct kobject *kobj, s
}

static ssize_t
-pci_read_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
- char *buf, loff_t off, size_t count)
+read_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
+ char *buf, loff_t off, size_t count)
{
struct pci_dev *dev =
to_pci_dev(container_of(kobj, struct device, kobj));
- int end;
- int ret;

if (off > bin_attr->size)
count = 0;
else if (count > bin_attr->size - off)
count = bin_attr->size - off;
- end = off + count;

- while (off < end) {
- ret = dev->vpd->ops->read(dev, off, end - off, buf);
- if (ret < 0)
- return ret;
- buf += ret;
- off += ret;
- }
-
- return count;
+ return pci_read_vpd(dev, off, count, buf);
}

static ssize_t
-pci_write_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
- char *buf, loff_t off, size_t count)
+write_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
+ char *buf, loff_t off, size_t count)
{
struct pci_dev *dev =
to_pci_dev(container_of(kobj, struct device, kobj));
- int end;
- int ret;

if (off > bin_attr->size)
count = 0;
else if (count > bin_attr->size - off)
count = bin_attr->size - off;
- end = off + count;
-
- while (off < end) {
- ret = dev->vpd->ops->write(dev, off, end - off, buf);
- if (ret < 0)
- return ret;
- buf += ret;
- off += ret;
- }

- return count;
+ return pci_write_vpd(dev, off, count, buf);
}

#ifdef HAVE_PCI_LEGACY
@@ -739,8 +717,8 @@ int __must_check pci_create_sysfs_dev_fi
attr->size = pdev->vpd->len;
attr->attr.name = "vpd";
attr->attr.mode = S_IRUSR | S_IWUSR;
- attr->read = pci_read_vpd;
- attr->write = pci_write_vpd;
+ attr->read = read_vpd_attr;
+ attr->write = write_vpd_attr;
retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
if (retval)
goto err_vpd;
--- a/include/linux/pci.h 2008-09-04 10:14:59.000000000 -0700
+++ b/include/linux/pci.h 2008-09-04 10:17:01.000000000 -0700
@@ -650,6 +650,10 @@ int pci_back_from_sleep(struct pci_dev *
/* Functions for PCI Hotplug drivers to use */
int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap);

+/* Vital product data routines */
+int pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
+int pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
+
/* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */
void pci_bus_assign_resources(struct pci_bus *bus);
void pci_bus_size_bridges(struct pci_bus *bus);
--



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